Combined with Lagrange, it is judged that the number of subgroups+must have a unit element+an element in the same subgroup and its inverse element. Subgroups, there are two common subgroups at first:
& lt{0，2，4}，+6 & gt； It is also a subgroup.
& lt{0，3}，+6 & gt； It is also a subgroup, 3 = 0.4817c = 48.17% c.
B accounts for 48. 17% of C.
meaning
A group that satisfies the commutative law is called a commutative group. Group is one of the most important concepts in mathematics, which has penetrated into all branches of modern mathematics and other disciplines. Where symmetry is involved, there are groups. For example, we can define all kinds of geometry by studying the invariance of graphs under transformation groups, that is, we can use transformation groups to classify geometry. It can be said that it is impossible to understand modern mathematics without understanding groups.